synaeresis

or syn·er·e·sis

[ si-ner-uh-sis ]
/ sɪˈnɛr ə sɪs /

noun Phonetics.

the contraction of two syllables or two vowels into one, especially the contraction of two vowels so as to form a diphthong.

Origin of synaeresis

1570–80; < Late Latin < Greek synaíresis act of taking together, equivalent to syn- syn- + (h)aire- (stem of haireîn to take) + -sis -sis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for synaeresis

synaeresis

/ (sɪˈnɪərɪsɪs) /

noun

a variant spelling of syneresis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012